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Grade and cross fall reference device for highway survey vehicles

  • US 4,674,327 A
  • Filed: 03/17/1986
  • Issued: 06/23/1987
  • Est. Priority Date: 03/17/1986
  • Status: Expired due to Term
First Claim
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1. An artificial horizon device comprising a pitch and roll displacement gyroscope, an erection system for erecting the gyroscope relative to a gravitational reference, means for measuring changes of angular displacement of the device in a horizontal plane, means for calculating from said measured changes the centripetal acceleration of the device in said plane, and means calculating therefrom the cumulative magnitude of spurious erection resulting from said acceleration, to provide a correction to be applied to a roll displacement output of said displacement gyroscope.

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